在ES细胞中,JARID2调节了多镇压复合体2与ES细胞的基因的结合
Diego Pasini1, Paul A C Cloos, Julian Walfridsson
1Biotech Research and Innovation Centre (BRIC), University of Copenhagen, Ole Maaløes Vej 5, 2200 Copenhagen N, Denmark.
Nature
|January 16, 2010
概括
含有Jumonji和ARID域的蛋白质JARID2对于招募聚合组 (PcG) 蛋白来向基因至关重要. 这种招募对于基因抑制,干细胞分化和正常发育至关重要.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发育生物学 发展生物学
- 分子生物学分子生物学
背景情况:
- 聚合组 (PcG) 蛋白调节对发育和细胞命运至关重要的基因表达.
- 聚合体抑制复合体2 (PRC2) 通过基因素H3氨酸27二和三甲基化 (H3K27me2 / 3) 调解转录抑制.
- 针对哺乳动物细胞中向基因的PcG蛋白招募机制在很大程度上是未知的.
研究的目的:
- 研究JARID2在招募PcG蛋白来向基因中的作用.
- 阐明JARID2在PcG介导的转录抑制和胚胎干细胞分化中的功能.
主要方法:
- 在PRC2和JARID之间形成一个稳定的复合体2.2.
- 全基因组定位分析以确定JARID2结合位点.
- 测试用于评估在JARID2抑制时的PcG蛋白和H3K27me3水平的招募.
- 评估JARID2在小鼠胚胎干细胞分化中的作用.
主要成果:
- JARID2与PRC2.2形成了一个稳定的复合体.
- JARID2 结合了 90% 以上的先前已识别的 PcG 标基因.
- JARID2足以将PcG蛋白招募到异质促进体.
- 抑制JARID2导致PCG结合的丧失和降低H3K27me3水平.
- JARID2对于小鼠胚胎干细胞的分化至关重要.
结论:
- JARID2是招募PcG蛋白质到它们的基因的关键因素.
- 在PcG介导的基因沉默,干细胞分化和胚胎发育中,JARID2起着至关重要的作用.
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